Lock mechanism for elevator landing doors



April'28, 1942. J. Aw. DoDD LOCK MECHANISM FOR ELEVATOR LANDING DOORS 4 sheets-sheet lv Filed Dec. 12, 1959 lNl Hill.

April 28,v 1942. J. w. DoDD LOCK MECHANISM FOR ELEVATOR LANDING DOORS 4 Sheets-Sheefl 2 Ffiled Dec. l2, 1959 SNN.

I w. L

I J' m,

April 2s, 1942. J, w, 'DODD 2,280,805

. LOCK MEGHANSM FOR ELEVATOR LANDING DOORS Iiled Dec. l2, 1 939 4 Sheets-Sheet 5 Olli/lll Im/EqLw:

April z8, 1942. J. Winona LOCK MECHANISM FOR ELEVATOR LANDING DOORS Filed Deo. l2, 1959 Sheets-Sheet 4 Patented Apr. 28, 1942 'UNI TE D vSTilXTIE. S PAT E N T A0 F FICE LOCK MECHANISM FOR ELEVATOR LANDING DOORS John W. Dodd, Watertown, Mass., assigner to 'George T. McLauthlin Company, Boston, Mass.,

a corporation of Massachusetts Application December 12, 1939, Serial No. 308,749

8 Claims. (Cl. IS7-31) Thisinvention relates to lockmechanisms for elevator landing doors, particularly .landing :doors which areassociated with a button-con rtrolled elevator.

.Theobject of this invention is to provide an improved lockrmechanism'of the character cle-- scribed which will be of simple and efficient constructionwand which -Will be comparatively inez:n 'pensive .to construct and install.

A;f'urther object of this invention is'to provide a simple and efficient lock mechanism of the character described which will permit operation of the elevator car only when all of the doors of .the elevator-shaft-way are closed and locked.

'Other objects y.of the'invention are to provide .aflock mechanism of zthe character described `which cannot be operated-to-free the door for 4.opening vunless the elevator` car is at'l the landing; to .provide for the :disposition of the doors, and practically all of the lock -mechanismtherefon in lclose proximity to, but-outside of.; the shaftfway'so as to-leave the latter free 'and clear'of practically vall, parts of the edoor structure, and to provide, as a new article of manufacture, a complete door unit `includingfa frame, la. pair of ,swing doors therefor and lock mechanism `tl'lroughwhich-,both of the swing ldoors and the elevator. car -are-` controlled.

:To these ends I` havepprovidedv an 'improved -lock mechanism for elevator landing doors constructed andfoperatingasset forth in the following description, theseveral novel features of the invention being pointed out and dened in thegclaims at the closethereof.

In.' the Aaccompanying drawings: -Figurel is an eleva-tion, partly in section and fpartlyfbrokenoaway.;of a self-contained door ,unit 'constructed inaccordance with my invention.

:Figure 2 is ,a sectionon line' 2-2 of Fig.- 1.

Figure 3 is an elevation, partly broken away andiin section, of an upper portion of the unit yshown infFigs. 1 Aand 2.

vFigure4 .is a section` on lined-4 of Fig. 3 with the .addition of a lportion of the building wall adjacent. to the doorway.

`Figure 5 is a detail, partly in section and partly in elevation, showing the mechanism for operating the detent or latch hereinafter described.

fFigure 5a is a detail. of the detent or latch hereinafter described.

AFigure 6 vis a section on line 6-I5 of Figs. 3

rand 4:with .the addition of` a portion of the build- `ing wall surrounding vthe door-way.

old plate- I2.

upon the sill of the landing opening and the AFigure 7 is an elevation of one of the yelectrical switches hereinafter described, the same being shown with its cover broken away.

YFigure 8 is a diagram illustrating the .circuit that is controlled by the pair of switches hereinafter described, one of the latter being illustrated in Fig. 7;

When my invention is embodied in a selfcontained door unit for incorporation in the Vwall of van elevator shaft-way at ya landing thereof, as herein shown, I provide a rectangular frame comprising a channel lintel I0 fastened atits opposite ends to the tops of two channel jambsll and Ita to the lower ends of which latterare fastened the opposite ends of a thresh- The threshold plate I2 is seated shaft-way wall is built up to lintel I0 and-lambs II and IIa. In Figi of the drawings the door unit is viewed from the landing side.

llastened to the under side of lintel IB, near the middle thereof,is a metal angular bracket I3 constructed -at its middle lwith a rectangular box-like portion I4 which serves asv-a.v socket for a bolt' I5, said socket portion I4 being open upon its bottom side to permit of movement of the lbolt .into and out of the same.

Bolt I5 is slidablymounted within a bracket IB that is rigidly fastened to a door I'I disposed lwithin the door-way frame It-I i-I2 at one side thereof and connected with the jamb Iia by hinges I 8 so that it can swing into and out of the vdoor-way frame.

The bracket I6 embraces the bolt I5 and is made with oppositely disposed splines or tongues I9 loosely occupying longitudinal grooves provided upon the opposite sides of the bolt I5 so that while said bolt is movable vertically endwise relatively to bracket I6, it is held by the Vlatter against movement in any direction laterali relatively to the door Il.

The bolt I5 is made with a downwardly extending stem 20 slidably mounted in brackets 2| fixed to door Il and at its lower end said stem is pivotally connected to one end of a link 22 whose opposite end is pivotally connected with a rocker 23.

Rocker 23 is provided with a shaft 24 which extends through the door I1 and is journaled within a bearing provided on the latter. A handle 25 is provided upon the outer or landing end of shaft 24 by means of which a. person standing at the landing can manually actuate the rocker 23. A handle 25, provided upon the inner or shaft-way end of shaft .24, provides for manual actuation of the rocker 23 by a person on the elevator car. This inner handle 26 is preferably disposed within a recess or pocket 21 provided upon the inner side of door I1.

Upon the outer side of door 1, and at the lower end thereof, I provide a second bolt 28 that is slidably mounted in brackets 2S fastened to door I1 so that it is movable vertically endwise toward and from threshold l2. This bolt is provided with an upwardly extending stem 30 whose upper end is pivotally connected to one end of a link 3| whose opposite end is pivotally connected with the rocker 23 diametrically opposite the point of connection of link 22 with said rocker. Near its upper end the stem 35 is supported and guided by a bracket fastened to door l1.

A second door 33, disposed within the door frame, is connected by hinges 34 with the opposite jamb II and when both doors I1 and 33 occupy their fully closed positions against the depending flange of bracket I3, as shown in Fig. 4, they are in alignment across the opening within said frame and disposed about three quarters of an inch away from the elevator shaft-way.

The proximate vertical edge portions of the doors I1 and 33 are stepped as indicated at I1a and 33o, Figs. 3 and 4, so that in order to fully close both doors it is necessary to first close door 33 and thereafter to close door |1. As shown in Fig. 3, and as indicated by dotted lines in Fig. 4, the bolt member I is made with a laterally extending arm 35 to cooperate with an adjustable switch member 36 forming part of a make-and-break switch that is indicated generally at 31 and shown diagrammatically at 31 in Fig. 8.

Fastened in position upon the outer side of door 33, near the top thereof, is an angular cam bracket 33, Figs. 3, 4 and 6, having a cam portion 39 to cooperate with the adjustable member 40 of a second make-and-break switch that is indicated generally at 4 I.

As shown in Figs. 3 and 7 the switch 31 comprises a box-like frame provided with a removable lid portion 31a and within this frame the adjustable member 36 is pivotally mounted as at 42, said member being provided with a weighted arm 43 which yielciingly urges said member downwardly and movement of said member in that direction being limited by the engagement of arm 43 with the inner side of the bottom wall of the box-like frame.

Mounted upon, but insulated from, the arm 43 is an upstanding post 44 provided at its upper end with a head 45 against which a movable contact washer 46 is yieldingly supported by .a spring 41, said spring surrounding the post 44.

Fixedly mounted within the box-like frame of switch 31 is a block of insulating material 43 gg which aremounted two fixed contacts 43 and IJ When the rocker 23, Figs. l and 2, is operated to thrust the bolt I5 upwardly into the socket i4 of bracket 3 the laterally extending arm 35 of the bolt swings the arm 36, Figs. 3 and 7, upwardly thereby seating the Contact 46 against thecontacts 43 and 53, and it will be clear that when bolt I 5 is moved downwardly arm 36 is r The switch 4| is a counterpart of the switch 31 and it will be clear that when door 33 is swung from an open position into its fully closed position against bracket I3 the cam 39 of bracket 38 raises the member 40 of switch 4| thereby closing the latter, and when said door is opened the member 40 of switch 4| falls by gravity and opens said switch.

As shown in Fig. 8 the contacts 43 of switches 31 and 4I are connected by a conductor 5|; the contact 50 of switch 31 is connected by a conductor 52 with one terminal of a control instrument I53 whose other terminal is connected by a conductor 54 with the xed contact 50 of switch 4|. The control instrument 53 is the usual means through which the push-buttons of the elevator apparatus control the up and down movements of the elevator car. It will thus be clear that the elevator car cannot be moved through operation of the push-buttons unless the circuit of the control instrument 53 is closed through both switches 35 and 4 I.

Within the socket |4 of bracket |3 is arranged a detent or latch 55 which is slidably supported by lugs 56, Figs. 4 and 6, which are bent inwardly from the opposite side walls of socket i4. A pin or bar 6I, mounted at its ends in the opposite side walls of socket i4, is disposed immediately above the detent or latch 55 and holds the latter against upward displacement relatively to the lugs 56.

The detent 55 extends inwardly from the lugs 56 through an aperture 51 provided in the rear depending flange or wall of bracket |'3 and beyond the latter is formed at its opposite sides with notches l58 as shown in Fig. 5a, said notches being occupied by the tines of the lower bifurcated end of an arm 59 depending from a horizontal rock-shaft 60. At its one end the rockshaft 60 is rotatably supported in position against the inner side or face of bracket I3 by a bearing bracket 62 fastened to the bracket I3 while at its opposite end said shaft 60 is rotatably supported by a bearing bracket 63 fastened to the inner side of the jamb I.

Alongside of the bearing bracket 63 the shaft 60 has rigidly fastened to it the hub 64 of an arm 65. The arm B5 is parallel with the shaft 60 and at its outer end has fastened to it an upwardly projecting extension 66 which carries a roller or truck 61 at its upper end. Between the hub 64 and a collar 68 that is fastened in position upon shaft 60 is a coiled spring 69, one end of which bears against the corner of lintel I0 as shown in Fig. 6, while the other end bears against a lug 10 provided on arm 65. This spring acts against the lug 10 to yieldingly urge the extension 66 away from the wall 1I of the shaftway with arm 59 held against bracket I3 and detent 55 at the limit of its movement toward bolt l5.

The bolt I5 is formed upon one side thereof with shoulders 12 to cooperate with detent 55, and it will be clear that when said detent occupies a position beneath either shoulder 12 the bolt i5 cannot be lowered to unlock the doors.

In Fig. 6, 13 represents a part of the elevator car and mounted thereon is a cam bracket 14. When bolt |5 is locked in its uppermost position by detent 55 the roll 5l' occupies a position in the path of cam bracket 14, and it will be clear that when, during either upward or downward movement of the car 13, the cam bracket moves into position against the roll 61 it acts through the latter, extension 66, arm 65, rockshaft GII and arm 59 to retract detent 55 thereby freeing bolt I but without unlocking the door. 'I'he cam bracket 14 is positioned on the car 13 so that when the floor of the latter is at a landing the elevated intermediate portion of cam bracket 14 is in engagement with roller 61 so that with the elevator stopped in that position the bolt I5 remains in door-locking position until manually retracted.

When the bolt-operating mechanism, including the rocker 23, Figs. 1 and 2, is set in position to hold the bolts I5 and 28 at the limit of their movements away from each other, the bolt 28 occupies a socket 15 formed in the threshold plate I2 while the bolt I5 occupies the socket I4 of bracket I3 and in this way the door I1 is locked closed at both its top and bottom.

The switches 31 and 4|, whose interior construction is illustrated in Fig. '1, are of ordinary construction and so also is the bolt-operating mechanism including the rocker 23.

Doors of the class described are commonly made from wood as shown at 11, Fig. 6, and are metal clad; that is, covered with -a sheet metal sheath 18 as a precaution against fire. Also, as shown at 19 in Fig. 1, one of the doors may be made with a window that is closed by a transparent pane of glass 80.

It will be understood that any other suitable type of make-and-break switch may be substituted for that illustrated in Fig. '1.

What I claim is:

1. The combination of a pair of movably supported elevator landing doors; manually operated bolt mechanism mounted on one of said doors for locking both doors in their closed positions, and a car-controlling mechanism including an electric circuit which is opened to render said control mechanism inoperative to effect movement of the car that is controlled by it, and two make-and-break switches arranged in series in said circuit, one `of said switches being controlled and operated by said bolt mechanism so that said switch is maintained closed by the same while the doors are locked closed by said bolt mechanism and so that said switch is opened when said bolt mechanism is adjusted to free said doors, and the other switch being independently controlled and operated by the other door so that it is maintained closed when said other door occupies its closed position and is opened when said other door is opened.

2. The combination of claim l wherein there is also provided car-controlled latch mechanism for normally holding said bolt mechanism in door-locking position, said latch mechanism being automatically operated by the elevator car upon arrival of the latter at the landing thereby to free said bolt mechanism.

3. The combination of a pair of elevator landing doors each of which is supported for movement independently; manually operated bolt mechanism including an adjustable bolt mounted on one of said doors for locking both doors in their closed positions; an electric car-controlling circuit, and adjustable circuit-controlling mechanism, said circuit-controlling mechanism being constructed and arranged so that movement of the other door into its closed position followed by adjustment of said bolt into door-locking position after its door has also been closed, act conjointly to adjust said circuit-controlling mechanism so as to render said circuit operable to effect movement of the elevator car but only while both doors are locked in their fully closed positions by said bolt.

4. The combination of claim 3 wherein there is also provided car-controlled latch mechanism for normally holding said bolt in door-locking position, said latch mechanism being automatically operated by the elevator car upon arrival of the latter at the landing thereby to free said bolt.

5. The combination of a pair of elevator landing doors each hingedly supported independently of the other door and one of said doors overlapping the other door when both doors are in properly closed positions; manually operated bolt mechanism including an adjustable bolt mounted on said overlapping door for locking both doors in their closed positions; an electric car-controlling circuit; adjustable circuit controlling mechanism through which movement of said overlapped door into its closed position and adjustment of said bolt into door-locking position after said overlapping door has been closed, act conjointly to adjust said circuit-controlling mechanism so as to render said circuit operable to effect movement of the elevator car but only while both doors are locked in their fully closed positions by said bolt.

6. The combination of claim 5 wherein there is also provided car-controlled latch mechanism for normally holding said bolt mechanism in door-locking position, said latch mechanism being automatically operated by the elevator car upon arrival of the latter at the landing thereby to free said bolt mechanism.

7. The combination of a pair of movably supported elevator landing doors; manually operated bolt mechanism mounted upon the outside of one of said doors for locking both doors in their closed positions; an electric car-controlling circuit; circuit controlling mechanism through which said two doors and said bolt mechanism co-act to render said circuit operable thereby to permit movement of the elevator car only when both doors are locked in their fully closed positions by said bolt mechanism, and latch mechanism movably supported at the opposite sides of said doors for holding said bolt mechanism in door-locking condition, said latch mechanism being automatically operated by the car upon arrival of the latter at the landing thereby to free said bolt mechanism.

8. The combination of a pair of elevator landing doors each of which is supported for movement independently; manually operated bolt mechanism including an adjustable bolt mounted on one of said doors for locking both doors in their closed positions; an electric car-controlling circuit, adjustable circuit-controlling mechanism mounted upon a fixed support adjacent to said doors, said circuit-controlling mechanism including means through which the other door when moved into its closed position effects a preparatory partial adjustment of said circuit-controlling mechanism and means through which said adjustment is completed by said bolt when the latter is shifted into door-locking position after its door has also been closed thereby to render said circuit operable to effect movement of the elevator car but only while both doors are locked in their fully closed positions by said bolt.

JOHN W. DODD. 

